Using the R Position Vector to find Velocity and Acceleration

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Physics
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9th - 10th Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the velocity of an object if its position is given by the equation: position equals 2.5 times time in the i direction, plus the quantity 2.5 times time minus 4.9 times time squared in the j direction?
2.5 i + (2.5 - 9.8t) j meters per second
2.5 i + (2.5 + 9.8t) j meters per second
2.5 i + (2.5 - 4.9t) j meters per second
2.5 i + (2.5 + 4.9t) j meters per second
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does it mean when an object is in uniformly accelerated motion?
The acceleration of the object remains constant over time.
The velocity of the object remains constant over time.
The acceleration of the object changes over time.
The velocity of the object changes at a constant rate.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a characteristic of uniformly accelerated motion?
The highest exponent in the position vector is 1.
The highest exponent in the position vector is 3.
The highest exponent in the position vector is 2 or less.
The position vector has no exponents.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the initial velocity of the object in the given position equation?
0 i + 2.5 j meters per second
2.5 i + 2.5 j meters per second
2.5 i + 0 j meters per second
0 i + 0 j meters per second
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you identify that the motion described is projectile motion?
The object has a constant velocity in both i and j directions.
The object has an acceleration in the i direction only.
The object has an acceleration in the j direction and constant velocity in the i direction.
The object has no acceleration in any direction.
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